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She was the daughter of Imperial Prince Morisada (守貞親王; 1179-1223) and thus granddaughter of Emperor Takakura. She was the sister of Emperor Go-Horikawa and Princess Kuniko. In 1221, her brother became Emperor, and their sister Kuniko ceremoniously functioned as his Empress. In 1232, her nephew Emperor Shijō became Emperor, and Princess Rishi was appointed to be his Honorary Mother and elevated to the position of Empress, a ceremonious title which made it possible for the court to have an Empress maintaining the role and position of in court rituals until the Emperor married.
In 1239, she ordained as a Buddhist nun and given the Dharma nameShinseichi (真性智). On the same day she was bestowed the honorary title Shikiken Mon'in (式乾門院).[2]
Unless otherwise noted (as BC), years are in CE / AD1 individuals that were given the title of empress posthumously
2 individuals elevated to the rank of empress due to their position as honorary mother of the emperor
3 Shōshi served briefly as honorary empress for her younger brother Emperor Go-Daigo